Hello Bradley!
It is generally as you said.
Actually, these web-safe anchors are generated by Docutils, not Sphinx.
Firstly, by nodes.make_id() function
(https://repo.or.cz/docutils.git/blob/refs/heads/master:/docutils/docutils/nodes.py#l2232).
In case of collision, "id1" anchors are coming from here
https://repo.or.cz/docutils.git/blob/refs/heads/master:/docutils/docutils/nodes.py#l1423.
I would not say it is a part of public API but is unlikely to be changed.
You might also consider setting explicit labels before titles. Either, manually
.. _my-custom-label:
Title
#
.. _set-to-anything-1:
Heading 1
*
Or, using an autosectionlabel builtin extension
(https://www.sphinx-doc.org/en/master/usage/extensions/autosectionlabel.html).
--
Matt
https://techwriter.documatt.com
> On 27. 12. 2021, at 12:10, bradley...@gmail.com
> wrote:
>
> I want to generate links from web pages that are not generated by sphinx,
> to headings and sub-headings in web pages that are generated by sphinx.
>
> I have noticed that sphinx automatically generates anchors for such links.
> For example, using sphinx v4.1.2, if the test_link.rst file contains the text
>
> Title
> #
>
> Heading 1
> *
>
> Heading 2
> *
>
> Heading-2
> *
>
> The the file test_link.hmtl generated by sphinx will contain the following
> link anchor for the headings in test_link.html:
>
> Title: href="#title"
> Heading 1: href="#heading-1"
> Heading 2: href="#heading-2"
> Heading-2: href="#id1"
>
> It seems that the heading text has been converted to lower case and that
> spaces ' ' have been converted to dashes '-'. It also seems if a conversion
> would yield the same value as a previous coversion, then a numbered id, that
> increases by one each time it is needed, is used for the link.
>
> 1. Are these conversion rules for link anchors correct ?
>
> 2. Are there ther conversion rules; e.g., other times that the numbered ids
> are inserted (and hence increase by one).
>
> 2. Are these rules part of the sphinx API; i.e., will it be the same in
> future versions of sphinx ?
>
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